I worked for several years in a similar fashion (working 6 hour days and attending classes at night, etc). The only word of advice / warning I'd add is that al

I worked for several years in a similar fashion (working 6 hour days and attending classes at night, etc). The only word of advice / warning I'd add is that although they add up to a similar number of hours each week, there's a huge difference between working 6 hours per day Monday to Friday, and working 8 hour days on say Monday to Thursday. When I transitioned to a research-based degree later on, I found it very difficult to make 2 hours per day amount to anything. It takes almost that much time to just get into the mode of working on your research, and you need to be self-motivated as there are no classes to keep you pitching up every time. An entire day per week dedicated to it would work much better.